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  #21  
Old 01-27-2017, 03:25 PM
DHeal DHeal is online now
 
Join Date: Sep 2006
Location: Windsor, California
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Sounds interesting, but not sure it will do much. I added a small aluminum shroud to generally route the avionics compartment fan exhaust (like warm baby's breath) towards the VR fins - not sure this is worth the effort. I may add a little external air scoop and ducting just ahead of the right-side cockpit air vent to blow a bit of outside air at the VR. Use nutplates on your in-cockpit VR and carry a spare VR.
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  #22  
Old 01-27-2017, 11:53 PM
dljosephson dljosephson is offline
 
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Location: monterey ca
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Default Ducati regulator failure causes

I've spent some time tearing apart Ducati regulators trying to answer this question. My day job is running a small electronics manufacturing company so we deal with failure analysis (fortunately not often!)

The regulator is marginal but will work fine and last a long time at full output if it's appropriately cooled, and was assembled correctly. Every failure I've seen was due to one or both of those assumptions being false. Most builders fail to route cooling air over the regulator, so the case gets hot and internal heat builds up. And, each of the three failed regulators I have taken apart had a cascade failure mode where contamination (dirt or oxidation) in solder joints caused them to fail -- resistance of the joint is increased because of decreased cross-sectional area, which causes the joint to heat up, sometimes enough to melt the solder, and soon to contribute more contamination to the joint.

It's not only the solder connecting the semiconductors but also the installation of the connector to the outside world where it's soldered to the PC board. One had gotten so hot that the insulation on the yellow wires was partially melted as much as 6 inches away from the regulator. If you see any discoloration of those wires, they are probably getting hot at the connector.
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  #23  
Old 01-28-2017, 02:17 AM
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DaleB DaleB is offline
 
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Just out of curiosity, do you know a non-destructive way to un-pot those suckers?
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  #24  
Old 01-28-2017, 03:20 AM
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Piper J3 Piper J3 is offline
 
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dljosephson -

Have you disassembled a JD VR to validate construction quality?

The Silent-Hektik VR is nearly $300... You can buy a lot of JD VR's for that price and keep the new administration happy that your not contributing to the trade deficit.
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Last edited by Piper J3 : 01-28-2017 at 03:27 AM.
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  #25  
Old 01-28-2017, 10:19 AM
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DaleB DaleB is offline
 
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Quote:
Originally Posted by Piper J3 View Post
dljosephson -

Have you disassembled a JD VR to validate construction quality?
I don't know if he has, but I have. It was typical of low end Chinese manufacturing, which is to say the actual PCB assembly was OK, but it was done with no apparent comprehension of the design. The PCB was simply dropped in place and potted... with the high power semiconductors on the board surface FACING AWAY FROM THE HEAT SINK. So that nice big chunk of aluminum is doing nothing other than, in typical fashion for parts sourced from some places, making it look like the original without actually working.



Quote:
Originally Posted by Piper J3 View Post
The Silent-Hektik VR is nearly $300... You can buy a lot of JD VR's for that price and keep the new administration happy that your not contributing to the trade deficit.
I'm balking at that price too, but buying a lot of JD-style regulators means replacing a lot of them as well. I'm not a big fan of just waiting for electrical components to fail in flight. For $300 I can gut the Chinese regulator and build my own into the case.
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  #26  
Old 01-28-2017, 12:01 PM
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Piper J3 Piper J3 is offline
 
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So, I guess the next question is - what is the field reliability of the JD VR in RV-12's?

I don't know if anyone has reported a failure.
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Hinckley, Ohio (1OA2)
EAA #499867
PPL/ASEL 1970 - Sport Pilot since 2007
80 hrs Flying Aeronca Chief 11AC N86203
1130 hrs Flying 46 Piper J-3 Cub N6841H
RV-12 E-LSA #120058 AWC July 2012 N633CM
RV-12 Bought Flying Oct 2015 with 48TT - Hobbs now 522

LSRM-A Certificate 2016
Special Thanks... EJ Trucks - USN Crew Chief A-4 Skyhawk
MJ Stricker (Father & CFI) - USAAF 1st Lt. Captain B-17H
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  #27  
Old 01-28-2017, 12:39 PM
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DaleB DaleB is offline
 
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Quote:
Originally Posted by Piper J3 View Post
So, I guess the next question is - what is the field reliability of the JD VR in RV-12's?

I don't know if anyone has reported a failure.
See post above -- mine failed after around 10 hours - and I don't have lights or dual screens. I'm very glad I didn't have it mounted inside the cockpit when it did, by the way. Even with it mounted forward of the firewall there was a strong and distinct burning smell.
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Previous RV-7 project (sold)

Last edited by DaleB : 01-28-2017 at 08:06 PM.
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  #28  
Old 01-28-2017, 07:16 PM
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Phantom30 Phantom30 is offline
 
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Gess guys...it would be worth $500 to have a vr that would be dependable and not fail (it is a rather important piece of equipment in the aircraft)...

Can't believe someone can't provide a fix????
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  #29  
Old 01-28-2017, 08:05 PM
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DaleB DaleB is offline
 
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That Silent Hektik is looking more attractive all the time. I went and flew today; the Ducati is putting out a whopping 13.1 V at 4500 RPM cruise. I brought the carcass of the JD replacement home from the hangar, I'll pull it apart further and see what I find.
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Omaha, NE
RV-12 # 222 N980KM "Screamin' Canary" (bought flying)
Fisher Celebrity (under construction)
Previous RV-7 project (sold)
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  #30  
Old 01-29-2017, 07:27 AM
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Gagarin737 Gagarin737 is offline
 
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I had an e-mail with the request if I can buy the regulators on this side of the ocean (I'm living in the Netherlands).
I mailed Silent Hektik with a request for a quotation for an initial order for 10 regulators (F4118). In that case the price will be $174,-/unit including shipping to the Netherlands.
My wife and I are working for an airliner so one of us can take them to the USA when we have a flight to the States and drop them off at FedEx or DHL. Shipping max $20? So total around $200,- (regulator + shipping + PayPal).

List complete for 10 units (30/01/2017)
Just back from DXB, will try to finalize the order this week before my next flight.
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Last edited by Gagarin737 : 01-30-2017 at 01:10 AM. Reason: Alex is number 10
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